Leaching of heavy metals from wood biomass ash, before and after binding in cement composite

Autor: Drljača Dijana M., Vukić Ljiljana M., Dragić Dajana M., Borković Aleksandra P., Botić Tatjana T., Dugić Pero T., Papuga Saša V., Šolić Marko D., Maletić Snežana P., Gvero Petar M., Savković Jelena R.
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Journal of the Serbian Chemical Society, Vol 87, Iss 9, Pp 1091-1108 (2022)
Druh dokumentu: article
ISSN: 0352-5139
1820-7421
DOI: 10.2298/JSC220217054D
Popis: Wood ash is a complex mixture of inorganic and organic compounds. It is heterogeneous in composition, which can vary considerably. Ash is mainly disposed of in landfills, which creates a risk for air, soil and groundwater contamination by trace elements. In order for wood biomass ash to be used as a secondary raw material, it is necessary to perform leaching tests, to determine which microelements it contains, and which of them could be released into the environment during the ash disposal. Sequential extraction (SE) showed that in the exchangeable and carbonate fraction, the most volatile metals As, Cd, Zn and Pb are released the most from the ash of deciduous trees, while the leaching of ash from coniferous trees is significantly lower. The evaluation of risk assessment code (RAC) for the tested biomass ash samples, indicates that Pb is a high-risk leaching element due to its condensation on the ash particles. By performing toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) tests, it was established that the released concentrations of tested metals are below the maximum allowable concentration, given by the regulation. The leaching tests of composites, prepared from wood ash in combination with cement, indicate that the leaching of ash is reduced to a minimum, and that all heavy metals are bound in a cement matrix, which indicates the possibility of using wood ash for construction purposes.
Databáze: Directory of Open Access Journals
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